Kobelt 7174 Instruction Manual

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7174 Rudder Feedback Unit
Owner’s Operation, Installation &
Maintenance Manual

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NOTES:
RECORD DATA BEFORE INSTALLATION FOR FUTURE REFERENCE
Model #:
Serial #:
Date of Purchase:
Date of Installation:

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TABLE OF CONTENTS
1Introduction .......................................................................................................... 4
1.1 Contact .......................................................................................................................4
1.2 Compliant Use ............................................................................................................4
1.3 Copyrights & Trademarks...........................................................................................4
2Safety.................................................................................................................... 5
2.1 Safety Alerts ...............................................................................................................5
2.2 Notice to Installer.......................................................................................................5
2.3 Product Hazards .........................................................................................................6
3Product Description ............................................................................................... 6
3.1 Technical Specifications .............................................................................................6
3.2 Model Code Key .........................................................................................................8
4Installation............................................................................................................ 9
4.1 Receipt........................................................................................................................9
4.2 Mechanical .................................................................................................................9
4.3 Electrical ...................................................................................................................10
5Commissioning .................................................................................................... 14
5.1 Electrical Check.........................................................................................................14
6Maintenance ....................................................................................................... 14
6.1 Preventative Maintenance.......................................................................................14
6.2 Service ......................................................................................................................15
6.3 Recommended Spare Parts......................................................................................15
7Troubleshooting .................................................................................................. 16
8Warranty............................................................................................................. 17
9Appendix A: Installation Dimensions .................................................................... 18
10 Appendix B: Parts List .......................................................................................... 19
10.1 Parts List Notes:..................................................................................................27
11 Appendix C: Determining RFU Generation and Required Retrofits ......................... 28
11.1 Determination of microswitch generation.........................................................28
11.2 Determination of Required Retrofit Kit..............................................................29
12 Appendix D: Installing Microswitch Retrofit Kit..................................................... 30
12.1 7174-RF-01 –Two Switch RFUs..........................................................................30
12.2 7174-RF-02 –Four Switch RFUs .........................................................................37

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1INTRODUCTION
1.1 CONTACT
Kobelt Manufacturing Co. Ltd.
8238 129th Street
Surrey, British Columbia
Canada, V3W 0A6
Sales Tel:
Fax:
Email:
Website:
[phone]
[phone]
[email protected]
www.kobelt.com
This document is intended to clearly present comprehensive product data and provide
technical information to assist the end user in design applications. Kobelt reserves the right,
without notice, to change the design, or construction, of any products and to discontinue or
limit distribution of any products. Kobelt also reserves the right to change, or update, without
notice, any technical information contained within this document.
Kobelt recommends that customers visit our website to check for updates to this Manual.
Once a product has been selected for use, it should be tested by the user to ensure proper
function in all possible applications. For further instructions, please contact our distributors or
visit our website.
1.2 COMPLIANT USE
This device is only intended for use by persons trained in operating marine systems.
The installer shall:
•Only use non-defective products.
•Check the safety of operation and the condition of the device before each use.
•Verify that the product is operational at all times and keep it in good working
conditions.
Only Kobelt Manufacturing Co. Ltd. Authorized Dealers or Authorized Technicians are to
repair Kobelt products.
1.3 COPYRIGHTS &TRADEMARKS
All product names, logos and brands are property of their respective owners. All company,
product and service names used in this manual are for identification purposes only. Use of
these names, logos, and brands does not imply endorsement.

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2SAFETY
2.1 SAFETY ALERTS
Throughout this manual, the following symbols, and their accompanying explanation, are
used to alert the user to special instructions concerning a service or operation that may be
hazardous if performed incorrectly or carelessly. The associated risk levels are stated below.
This symbol indicates an imminently hazardous situation which, if
not avoided, will result in death or serious injury.
This symbol indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
This symbol indicates a hazardous situation, which if not avoided,
could result in minor or moderate injury.
This symbol informs the reader of events not related to personal
injury but which there is a risk of damage to property or equipment.
This symbol informs the reader of safety-related instructions or
procedures.
2.2 NOTICE TO INSTALLER
Disregarding the following safety measures can result in an accident, causing severe injury to
personnel and damage to material assets.
•Only use the product as directed in this manual.
•Never put the product into service if there is evidence of visible damage.
•Never put the product into service before fully completing installation and
commissioning.
•Do not carry out any modifications to the product.
•Only use authentic Kobelt spare parts.
•Observe all local regulations, directives and laws during the installation of this product.
•All installation, commissioning, and maintenance work must only be conducted by
qualified personnel. (For the purpose of this manual, qualified personnel are persons
who are familiar with the assembly, installation, commissioning, and operation of the
product and who have the qualifications necessary for their occupation.)
•Observe all specifications in this manual. If these guidelines are not followed and
damage occurs, the warranty will be voided.

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2.3 PRODUCT HAZARDS
Disconnect Power: Turn off power at distribution panel before
beginning installation to protect installer from electrical hazards.
Voltage and Current Compatibility: Confirm that the power source
is compatible with the maximum voltage and current ratings of is
product variant. Failure to do so could result in damage or fire.
3PRODUCT DESCRIPTION
The Kobelt 7174 Rudder Feedback Unit (RFU) can be configured to have up to four
potentiometers and two rudder end stop switches per side. It can be used as an input to Full
Follow Up (FFU) electronic steering systems, autopilots, and rudder angle indicators.
Movement of the rudder adjusts the internal potentiometer(s). The 7174 Rudder Feedback
Unit can be used for steering applications, other marine applications, or industrial
installations. The 7174 is designed for indoor and outdoor installation with a robust die cast
bronze and stainless-steel construction to provide a long service life in a harsh marine and
salt-water exposed environment.
3.1 TECHNICAL SPECIFICATIONS
Table 1: 7174 Technical Data –Standard Variants
MODEL
7174
KOBELT PART #
7174-A
7174-B
POTENTIOMETER
1kΩ
2x 1kΩ
MAX. POTENTIOMETER POWER
1 W
SWITCH CONTACTS
2x SPDT
2x SPDT
CONTACT RATINGS
250VAC/24VDC –10A
CONNECTIONS
1x 3C/18 Pigtail
2x 3C/18 Pigtail
OPERATING TEMPERATURE
-25°C to 70°C [-13°F to 158°F]
PRODUCT WEIGHT
2.9 kg [6.5 lbs]
SURFACE FINISH
Plain Bronze
Technical data and specifications are also available from our datasheet posted on
www.kobelt.com or the technical drawings in Appendix A.

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Figure 2: Product overview, 7174-CE shown.

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3.2 MODEL CODE KEY

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4INSTALLATION
4.1 RECEIPT
Kobelt offers the 7174 rudder feedback unit in
several configurations (reference section 3.2).
Upon receipt of the device ensure that the
model number and serial number are noted on
the table in page 2 of this manual. The serial
number can be found in the location noted at
right. This model number will determine what
spare parts are applicable.
4.2 MECHANICAL
Ideally, the Rudder Feedback Unit should be
mounted as close as possible to the tiller arm. Excessive lengths of connecting rods will lead
to flexing and inaccuracies in the reported rudder position.
Minimize the connecting rod length to minimize errors in reported
rudder position.
The Rudder Feedback Unit is equipped with (3) three ¼ UNC screws installed through the top
surface for direct mounting. Reference the general arrangement drawing in Appendix A for
the bolt pattern.
4.2.1 Mechanical Linkage
The RFU lever is provided with
seven 5/16” [8mm] diameter holes
on a 5/8” [16 mm] pitch. Select the
outer most hole on the RFU lever
possible to minimize errors arising
from backlash. Locate the
connecting rod position on the tiller
arm to ensure that rudder stop limit
switches trip without crashing into
the RFU end stops (+/-44o). Follow
the table below to ensure that the
gearing between rudder movement
and RFU are synchronized:
7174
Rudder Movement
(H.O. to H.O.)
(deg)
Travel
Ratio
Dimension
‘R’
in [mm]
70
1.16:1
9.04 [230]
74
1.11:1
8.62 [219]
80
1.04:1
8.07 [205]
84
1.00:1
7.75 [197]
90
0.95:1
7.33 [186]
94
0.91:1
7.09 [180]
Figure 3: Part Identification
Table 2: RFU / tiller synchronization

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When installing the RFU remember to follow these tips:
•Ensure 90° relationships between the tiller arm, RFU lever and connecting link are
maintained with the rudder in mid-ships position during alignment of all
mechanical components.
•Ensure rudder feedback arm and rudder stock clamp swing equally each side of
mid-ships position.
•Locate 7174 Rudder Feedback Unit near rudder stock on a level surface.
•Threaded connection rod may need to be adjusted in order to achieve the correct
mounting geometry.
Reference the figure below for clarification.
Note: Connection kits are available from Kobelt (P/N: 7174-010X).
4.3 ELECTRICAL
When making the electrical connections, locate the electrical junction box;
•Within 6 feet [1.8 m] of the rudder feedback unit.
•Placed as to protect external electrical cable from damage.
Figure 4: RFU Installation

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The cable gland locations are located on the bottom of the unit and are shown in Figure 2.
The internal potentiometer wire connections are shown in Figure 5. Figure 6-Figure 8 depict
the wiring assignment by color for various two limit switch models. Identify your specific
configuration and refer to the appropriate diagram. Four limit switch configurations are
shown in Figure 9.
The operating direction of the Potentiometer in relation to the Rudder Feedback Unit handle
is shown in Figure 8.
The product’s 3C/18AWG electrical cable contains the following wires and related functions:
Table 3: 7174 Wire Connections
7174
Wire #
Wire Name
Colour
Gauge
Function
1
POT+
White
18AWG
FFU potentiometer power supply
connection.
2
POT WIPER
Green
18AWG
FFU potentiometer signal connection.
3
POT-
Black
18AWG
FFU potentiometer ground connection.
Figure 5: 7174 Potentiometer Wiring Diagram

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Figure 6: 7174-A wiring
Figure 7: 7174-B wiring

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Figure 8: 7174-C wiring
Figure 9: 7174-XG Internal Wiring Diagram

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When wiring the rudder end stop switches directly to the steering solenoid valves, it is
recommended to place a 1N4007 protection diode across the coil terminals.
Failure to use a TVS diode when switching solenoid coils will reduce
the life of the rudder end stop switches.
5COMMISSIONING
5.1 ELECTRICAL CHECK
Ensure that the rear cover is installed and secured before powering
on the 7174.
•Confirm that the electrical connections to the 7174 have been made.
•Confirm that port and starboard rudder movements are displayed correctly at the
rudder angle indicators.
•Confirm that the rudder range of motion is reported correctly to the rudder angle
indicators and steering controller.
•Ensure that the rudder end stop switches trip before the rudder or RFU lever
impacts the rudder stops. See section 6.2.1 for adjusting.
The Functional Test should be carried out while the vessel is still at
dock and before it is taken out to sea after installation has been
completed.
6MAINTENANCE
6.1 PREVENTATIVE MAINTENANCE
•Quarterly (4 times/year)
oVisually inspect wire and cable insulation for splits or damage.
oEnsure there is no visible corrosion on the unit.

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oConfirm that the rudder angle indicators indicate zero degrees when
the rudder is centered
•Every (2) two years
oConfirm all electrical screw terminals are secured.
oConfirm cable glands are secured to cables.
6.2 SERVICE
6.2.1 Rudder End-stop Switches
To adjust the rudder end-stop trip position follow these instructions:
1. Position the rudder to the desired trip position.
2. Remove the RFU cover.
3. Locate the relevant switch trip cam (see Figure 2).
4. Loosen the two screws and rotate the cam until the switch just trips and secure
the two screws.
5. Repeat for the other switch.
6.2.2 Potentiometer Centering
When replacing the potentiometer or if the setting has become disturbed, follow these steps
to center the output:
1. Position the rudder in the center
(dead ahead) position.
2. Remove the RFU cover.
3. Locate the potentiometer in need of
centering (see Figure 2).
4. Connect a multimeter to the Pot –
(white wire) and the Pot Wiper
(green wire). Set the meter to read
resistance.
5. Loosen the two locking set screws
on the pinion gear with a 1/16-inch
Allen key.
6. Using a short flat head screwdriver,
rotate the potentiometer shaft until the meter reads half of the rated output (500
ohms for a 1K potentiometer).
7. Tighten the two locking set screws and replace the cover.
6.3 RECOMMENDED SPARE PARTS
Depending on the severity and criticality of service, it may be necessary to keep spare
potentiometers on hand.

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When purchasing replacement parts refer to Appendix B: Parts List at the back of this manual
for Kobelt component Part Numbers.
It is recommended that any required service work on a Kobelt
product be performed by a factory authorized service
representative. Please contact the nearest Kobelt authorized
distributor for assistance.
7TROUBLESHOOTING
If you encounter problems with the operation of your product, please refer to the trouble-
shooting suggestions before contacting Kobelt for assistance. If the steps below do not
resolve your issue, please reach out either Kobelt directly or our Dealers in your area.
Table 4: Common Solutions
Problem
(Issue encountered)
Cause
(What it means)
Corrective Action
(What to do)
Rudder Feedback Unit
action is reversed.
Wiring is backwards.
Swap the POT+ and POT- output
wires to their respective system
connections.
Rudder Feedback Unit
does not move rudder
at all.
The rest of the system
isn’t hooked up correctly.
1. Check system wiring.
2. Confirm wiring to Rudder
Feedback Unit.
Broken potentiometer or
contact.
1. Use a multi-meter to monitor
the resistance of the wiring
between potentiometer contacts.
2. Check for normal operation of
the potentiometer by measuring
the connection while moving the
Rudder Feedback Unit.
3. Check potentiometer directions.
4. Replace any damaged
potentiometers.
Wiring is wrong.
Check wiring against User Manual
wiring diagrams for Feedback Unit
and connected Products.

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8WARRANTY
Kobelt Manufacturing Co. Ltd. (“Kobelt”) warrants the Products and Parts manufactured by
Kobelt to be free from defects in workmanship or material and that said products are
designed mechanically and functionally to perform to specifications.
This warranty is effective providing:
•The equipment is used within the intended operating conditions and in accordance with
Kobelt recommendations
•The equipment is installed according to equipment diagrams, specifications and
recommendations which Kobelt has provided
This warranty becomes invalid if the factory supplied serial number has been removed or
altered on the product. This warranty does not cover cosmetic damage or damage caused by
an act of God, accident, misuse, abuse, negligence or modification of any part of the product.
This warranty does not cover damage due to improper operation or maintenance, connection
to inappropriate equipment or attempted repair by anyone other than an authorized Kobelt
representative.
Upon identification of a potential issue or defect with a Kobelt Product or Part, the Warranty
Applicant (“Applicant”) must immediately contact Kobelt and describe the issue in writing, by
letter, fax, email or other electronic conveyance. Kobelt will then assess the cause of the
defect and determine warranty applicability and appropriate remediation.
If any part is found to be defective, Kobelt will replace said part FOB the Kobelt factory
provided that any such defective part is returned by the Buyer with freight and applicable
forwarding charges prepaid by the Buyer. Kobelt’s sole obligation to the Applicant will be to
repair or replace the defective part with same or similar product, to a maximum value of the
list price of the product or part. The Kobelt warranty does not cover labour charges, travel or
any other associated expenses.
All Products and Parts manufactured by Kobelt, are subject to a warranty against
manufacturer’s defects in materials or workmanship for a period of two (2) years from the
date of purchase.
Kobelt will be responsible for all Products or Parts sold by Kobelt but manufactured by 3rd
party manufacturing companies. However, these products and parts are subject to applicable
3rd party warranties and may not be the same as the Kobelt warranty.

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9APPENDIX A: INSTALLATION DIMENSIONS

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10 APPENDIX B: PARTS LIST
Figure 10: 7174-AD Parts Diagram
7174-AD

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Table 5: BOM for 7174-AD
ITEM
QTY.
PART
NUMBER
DESCRIPTION
NOTES
(SEC. 10.1)
1
1
7174-0001
HOUSING
-
2
1
7174-0002
COVER; RUDDER FEED BACK UNIT
-
3
1
7174-0003
LEVER; RUDDER FEEDBACK UNIT
-
4
3
7174-0009
SPACER, BRASS
-
5
1
7174-0010
SHAFT
-
6
2
6001-0248
CABLE GLAND; M16 X 1.5, .197-.394 CABLE,
PA6, BLACK
-
7
2
6001-0248-
W-M16
WASHER, SEALING, M16, POLYETHYLENE
-
8
1
1001-1020
SCREW - HEX HD; 1/4-20 X 1-1/4, 18-8
-
9
3
1001-1048
1/4-20 X 3.0, HEX HD. CAPSCREW, SS
-
10
4
1010-0808
SCREW, RND HD PHIL, #10-24 X 1/2, 18-8 SS
-
11
6
7174-0008
SPACER, 7172, 1.04IN LG
-
12
1
7174-0007
POT BRACKET
-
13
1
7174-0006
BRACKET; RUDDER FEEDBACK UNIT
-
14
3
1002-0844
CAP SCREW - SKT HD; #10-24 X 2-3/4 LG, 18-
8
-
15
1
1101-0016
O-RING, 3/4 X 5/8 X 1/16, NBR70
-
16
1
7174-0004
CAM PLATE
-
17
1
POT-1
POTENTIOMETER, 1K, 1TURN, 340 DEG,
22MM DIA
-
18
1
6639-0001
SHIM WASHER, 10MM X 2MM, AISI 304
-
19
1
Y-3220
SPUR GEAR - BRASS; 32P/20T/B
STYLE/.250IN BORE + 2
SET SCREWS
-
20
1
YPB-3264
SPUR GEAR 64T DERLIN W/ 5/16 BRASS
INSERT
-
21
1
7174-0027
GASKET
-
22
2
7174-0005
CAM, SWITCH TRIP
-
23
4
1012-0606
SCREW, PAN HD, PHL DRIVE, 6-32 x 3/8IN,
18-8 SS
-
24
1
1024-0816
PIN, .1875 DIAMETER
-
25
2
6014-0002
CABLE; 4C/18AWG, 600V, GRY
-